EP2378311A1 - Système et procédé de localisation et de télécommunication - Google Patents

Système et procédé de localisation et de télécommunication Download PDF

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Publication number
EP2378311A1
EP2378311A1 EP10159956A EP10159956A EP2378311A1 EP 2378311 A1 EP2378311 A1 EP 2378311A1 EP 10159956 A EP10159956 A EP 10159956A EP 10159956 A EP10159956 A EP 10159956A EP 2378311 A1 EP2378311 A1 EP 2378311A1
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EP
European Patent Office
Prior art keywords
telecommunication
signal
navigation
temporal
temporal gaps
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP10159956A
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German (de)
English (en)
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EP2378311B1 (fr
Inventor
Moni Malek
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ML-C MobileLocation-Company GmbH
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ML-C MobileLocation-Company GmbH
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Priority to AT10159956T priority Critical patent/ATE549643T1/de
Priority to EP10159956A priority patent/EP2378311B1/fr
Priority to PCT/EP2011/055966 priority patent/WO2011128422A1/fr
Publication of EP2378311A1 publication Critical patent/EP2378311A1/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service

Definitions

  • the present invention relates to the field of telecommunication and tracking systems. More precisely, it relates to communication over a mobile telecommunication network and location determination via a satellite navigation system.
  • GSM Global System for Mobile Communication
  • UMTS Universal Mobile Telecommunications System
  • GPS Global Positioning System
  • Mobile devices are known that comprise both a telecommunication module and a location determination module.
  • Such devices may be smart phones, in which the telecommunication feature and the location determination feature are aggregated, or tracking devices, in which the telecommunication feature is used to transmit the determined location of the tracking device to a location server.
  • Integrating both a telecommunication RF (radio frequency) signal transceiver and a navigation RF signal receiver in one device may cause interference effects between the two signals. Such interference may lead to degraded performance, in particular with respect to the navigation RF signal, as a navigation RF signal is significantly weaker than a telecommunication RF signal. Such interference effects may result in slower and less reliable determination of the location, while power consumption may be increased due to multiple retries.
  • the improvement can concern the speed and/or reliability and/or power consumption of the location determining process.
  • the present invention is based on the idea that mobile telecommunication networks have temporal gaps in their telecommunication RF signal in which the mobile device is not transmitting and/or not receiving. During these temporal gaps, the navigation RF signal is not degraded, and thus the location can be determined without interference caused by the telecommunication RF signal transceiver.
  • the invention has the considerable advantage of speeding up and/or improving the reliability of the determination of the location. This is especially advantageous, e.g., for emergency tracking devices, in which the current location is transmitted to a control room upon detection of an emergency event. Smart phone users with an active voice call or an active data session and concurrent use of the navigation feature of the phone will experience a more reliable synchronization with the satellite navigation system. Additionally, power is saved as the location determination takes only place in time intervals with an undistorted navigation RF signal.
  • Major interference may occur during the time where a mobile device transmits telecommunication RF signals, whereas minor signal interference may occur while the telecommunication receiver is active.
  • some embodiments use the temporal gaps of the transmitted telecommunication RF signal only, whereas other embodiments use the overlap of temporal gaps of the transmitted telecommunication RF signal and the temporal gaps between the periods of activity of the telecommunication receiver.
  • the received navigation RF signal is analyzed and depending on the signal quality either the temporal gaps of the transmitted telecommunication RF signal are used, or the overlap of temporal gaps of the transmitted telecommunication RF signal and the temporal gaps of the received telecommunication RF signal is used to control the activity of the navigation RF signal receiver.
  • an interleaved telecommunication and location determining controller communicates with a first baseband controller for telecommunication purposes and a second baseband controller for location determining purposes.
  • the interleaved telecommunication and location determining controller ensures that the second baseband controller is only active if the first baseband controller does not transmit.
  • the interleaved telecommunication and location determining controller ensures that the second baseband controller is only active if the first baseband controller does neither transmit nor receive.
  • Some embodiments of the invention use passive processes to detect temporal gaps and to estimate the next temporal gap. In some embodiments, only the bursts of the transmitted telecommunication RF signal are taken into account, thus allowing navigation RF signal reception at the same time as telecommunication RF signal reception. In other embodiments, navigation RF signals are only processed if both the telecommunication transmitter and the telecommunication receiver are inactive.
  • Some embodiments of the invention cover active processes to increase the duration of temporal gaps or the number thereof by scheduling and reducing the number of transmitted telecommunication RF signal bursts and/or by scheduling the activity of the telecommunication receiver.
  • the telecommunication transmitter and/or the telecommunication receiver is/are temporarily disabled to obtain further temporal gaps, during which the navigation RF signal can be processed without distortion. This is useful, if there is a demand for an immediate determination of the location while temporarily lowering the quality or availability of the telecommunication functionality.
  • the invention is generally applicable to all kinds of mobile telecommunication networks, either mobile phone cellular networks or satellite phone networks.
  • the mobile phone cellular networks comprise Second Generation (2G) networks like the Global System for Mobile Communications (GSM), including its supplements General Packet Radio Service (GPRS) and Enhanced Data rates for GSM Evolution (EDGE), or Interim Standard 95 (IS-95, also known under its brand name cdmaOne), furthermore Third Generation (3G) networks like the Universal Mobile Telecommunications System (UMTS), including its supplements High Speed Downlink Packet Access (HSDPA) and High-Speed Uplink Packet Access (HSUPA), or CDMA2000.
  • the satellite phone networks comprise Globalstar, Inmarsat, Iridium, MSAT, SkyTerra, Terrestar, and Thuraya.
  • the invention can be applied to all kinds of satellite navigation systems, like the Global Positioning System (GPS), the Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS), the Galileo positioning system (Galileo), or the Compass navigation system (Compass).
  • GPS Global Positioning System
  • GLONASS Globalnaya Navigatsionnaya Sputnikovaya
  • Galileo Galileo positioning system
  • Compass Compass navigation system
  • the method is implemented in an integrated circuit.
  • this circuit may be solely the interleaved telecommunication and location determining controller, or may be integrated together with the baseband controllers.
  • the integrated circuit may comprise all controllers and RF signal processors, thus providing a single chip solution for both telecommunication and location determining functionality.
  • the invention also comprises a machine-readable medium having suitable program instructions to realize the described method, for example, on a general-purpose computer or in a programmable integrated circuit.
  • the machine-readable medium may be any kind of physical or non-physical data carrier like, for example, a computer disk or a CD-ROM or a semiconductor memory or a signal transmitted over a computer network.
  • Fig. 1 shows a mobile device 10, comprising a telecommunication section 12 and a location determining section 14.
  • the telecommunication section 12 comprises an antenna system 16, a telecommunication RF signal processor 18, and a first baseband controller 20.
  • the telecommunication RF signal processor 18 is controlled by the first baseband controller 20 via an interface 22.
  • the location determining section 14 comprises an antenna system 24, a navigation RF signal processor 26, and a second baseband controller 28.
  • the navigation RF signal processor 26 is controlled by the second baseband controller 28 via an interface 30.
  • Fig. 2 shows the telecommunication RF signal processor 18 comprising a telecommunication transmitter 32 and a telecommunication receiver 34.
  • Fig. 3 shows the navigation RF signal processor 26 comprising a navigation receiver 36.
  • telecommunication RF signals are handled by the antenna system 16.
  • the telecommunication RF signal processor 18 converts the received telecommunication RF signal to its baseband frequency and hands it over to the first baseband controller 20. Information is decoded from the received signals in the baseband controller 20.
  • the first baseband controller 20 converts the information to be sent into a baseband signal according to the underlying telecommunication standard, whereas the baseband signal is converted into a telecommunication RF signal in the telecommunication RF signal processor 18.
  • Fig. 4 shows the operation of the location determining section 14.
  • Navigation RF signals 38 are handled by the antenna system 24.
  • the navigation RF signal processor 26 converts the received navigation RF signal 38 to its baseband frequency and hands it over to the second baseband controller 28.
  • Information is decoded from the received signal in the baseband controller 28. Segments of this information are commonly referred to as navigation chips 40.
  • Fig. 5 shows a mobile device 50 according to an embodiment of the invention.
  • the mobile device 50 comprises the components of the mobile device 10 as shown in Fig. 1 , and further comprises an interleaved telecommunication and location determining controller 52 that controls the telecommunication section 12 and the location determining section 14 by using an interface 54 to the first baseband controller 20 and an interface 56 to the second baseband controller 28.
  • TDMA Time Division Multiple Access
  • the telecommunication RF signal transmitted in a time slot is referred to as burst during which the telecommunication transmitter 32 is active.
  • the telecommunication RF signal received in a time slot is also referred to as a burst during which the telecommunication receiver 34 is active.
  • the time in which the telecommunication transmitter 32 or the telecommunication receiver 34 is inactive is referred to as temporal gap.
  • a burst in the sense of this document refers to a telecommunication RF signal while it is transmitted or received
  • a temporal gap refers to an inactive telecommunication transmitter 32 or to an inactive telecommunication receiver 34.
  • CDMA Code Division Multiple Access
  • the interleaved telecommunication and location determining controller 52 may enforce temporal gaps by temporarily disabling the telecommunication transmitter 32 and/or the telecommunication receiver 34.
  • Fig. 7 shows the activity of the telecommunication receiver 34, the telecommunication transmitter 32, and the navigation receiver 36 of a conventional mobile device 10.
  • the mobile device 10 is operated in a GSM network and uses GPS to determine the location.
  • the scenario of Fig. 7 is neither restricted to a GSM network nor to GPS, it is also applicable to other mobile telecommunication networks and other satellite navigation systems.
  • the mobile device 10 has either an active voice call, or an active fax or data session, or performs signaling, and there is a location determination request at the same time.
  • the "0" status in the diagram shows an inactive component, whereas the "1" status refers to an active component.
  • the telecommunication receiver 34 receives a telecommunication RF signal 74 from the mobile telecommunication network.
  • the bursts 76.1, 76.2, and 76.3 (referred to as 76.x) comprise the received message, which is either traffic payload (voice, fax, data) or a signaling message.
  • the bursts 78.1 and 78.2 (referred to as 78.x) are due to measurement purposes to monitor neighbor cells of the mobile telecommunication network for a potential handover.
  • the telecommunication transmitter 32 transmits a telecommunication RF signal 70 to the mobile telecommunication network.
  • the bursts 72.1 and 72.2 (referred to as 72.x) comprise the transmitted message, which is either traffic payload (voice, fax, data) or a signaling message.
  • the navigation receiver 36 Uncorrelated to the telecommunication RF signals, the navigation receiver 36 receives a navigation RF signal 38 from the satellite navigation system.
  • Interference effects might occur between the telecommunication RF signal and the navigation RF signal, when they overlap at least partly.
  • the navigation RF signal 38 is rather weak, compared to the telecommunication RF signal. Due to the small distance between the antenna systems 16 and 24, the navigation RF signal 38 may be distorted while the telecommunication transmitter 32 is active. Minor interference effects may also occur while the telecommunication receiver 34 is active.
  • navigation chips 40 can only be successfully decoded from the navigation RF signal 38 while both the telecommunication transmitter 32 and the telecommunication receiver 34 are inactive or - if the navigation RF signal is stronger - at least while the telecommunication transmitter 32 remains inactive.
  • the navigation receiver 36 is active all the time while trying to determine the location, as shown in characteristic 80.
  • the efficiency of this navigation receiver 36 is rather low during an active telecommunication section 12: As shown in characteristic 82, only one navigation chip 40 can be decoded.
  • the objective is to activate the navigation receiver 36 only during a time interval during which the navigation RF signal 38 can be received while the telecommunication transmitter 32 and the telecommunication receiver 34 are inactive.
  • Fig. 8 shows the same scenario as in Fig. 7 , but handled by a mobile device 50 as shown in Fig. 5 , which is operated in a GSM network and uses GPS to determine the location. In other embodiments, different mobile telecommunication networks and different satellite navigation systems are used.
  • the mobile device 50 has either an active voice call, an active fax or data session, or performs signaling, and there is a location determination request at the same time.
  • the interleaved telecommunication and location determining controller 52 knows about the timing of an active or inactive telecommunication transmitter 32 and telecommunication receiver 34. The controller 52 decides which portion of the navigation RF signal 38 is to be processed and which is not. In conjunction with the first baseband controller 20, the controller 52 informs the second baseband controller 28 whether to process the navigation RF signal 38 or not. This approach saves time and power for avoided repeated signal analysis, as the navigation receiver 36 will be inactive while a potentially degraded navigation RF signal 38 is received, as shown in characteristic 84. Again, only one navigation chip 40 can be decoded according to characteristic 86, but less power is consumed in the process.
  • the interferences during an active telecommunication receiver 34 are small enough to decode navigation chips 40 during the bursts 76.x and 78.x.
  • the navigation RF signal 38 above a certain signal strength is also decoded during the periods of activity of the telecommunication receiver 34.
  • the navigation receiver 36 may then be deactivated during the periods of activity of the telecommunication receiver 34 if the navigation chip decoding drops below a certain success rate.
  • the interleaved telecommunication and location determining controller 52 temporarily disables the telecommunication transmitter or the telecommunication receiver, in case there are not enough temporal gaps available for an evaluable determination of the location.
  • the interleaved telecommunication and location determining controller 52 knows the timing of the periods of activity of the telecommunication transmitter 32 and the telecommunication receiver 34.
  • the interleaved telecommunication and location determining controller 52 is capable of estimating suitable temporal gaps in advance.
  • the interleaved telecommunication and location determining controller 52 prevents the second baseband controller 28 from processing portions of the navigation RF signal 38 if there is not enough time to find the start of a navigation chip 40.
  • the navigation receiver 36 is only activated if the estimated temporal gap exceeds at least twice the duration of a navigation chip.
  • the characteristic 92 shows that only the temporal gap between the bursts 72.1 and 76.2 is wide enough to certainly decode a navigation chip. Nevertheless, the temporal gap between the bursts 76.2 and 72.2 contains one navigation chip, which could be decoded, if the navigation receiver 34 were active. In this embodiment, the navigation receiver 34 remains inactive during that temporal gap, as the temporal gap does not exceed twice the duration of a navigation chip.
  • the characteristic 92 of Fig. 9 shows that the navigation receiver 36 is only active if there is sufficient time to decode at least one navigation chip 40. This leads still to one navigation chip 40 as shown in characteristic 94, but power consumption has further been reduced.
  • the expected timing of the satellite navigation RF signal is determined. This can be done, for example, by initially activating the navigation receiver 34 as described above. As soon as a certain degree of time synchronization with the signals of the satellite navigation system has been established, so that the start time of the next navigation chips can be estimated, the navigation receiver 34 can be activated whenever the temporal gap is sufficient to decode at least one navigation chip 40, even if the temporal gap only slightly exceeds the duration of one navigation chip. In such an embodiment, the temporal gap between the bursts 76.2 and 72.2 of Fig. 9 could be used to activate the navigation receiver 34 and to decode a further navigation chip 40.
  • the interleaved telecommunication and location determining controller 52 actively manages the timing when a telecommunication RF signal burst is to be transmitted or when the telecommunication receiver 34 is activated to receive a telecommunication RF signal. This functionality depends on the underlying network and the type of burst since not all bursts can be shifted in time.
  • Fig. 9 and 10 show in example in which the telecommunication receiver 34 is activated at a different time than in Fig. 8 .
  • the activation time of the telecommunication receiver 34 for receiving a first monitoring burst 78.1 has been shifted to a more suitable time such that there is now a wider gap between the bursts 76.1 and 76.2 ( Fig. 9 ).
  • two neighbor cells are monitored shortly after each other, as shown in the monitoring bursts 90.1 and 90.2 (referred to as 90.x).
  • TDMA based networks specific time slots are assigned for the communication between the mobile device 50 and the mobile telecommunication network.
  • GSM, GPRS, and EDGE have a TDMA frame cycle of 4,615 ms, with 576,875 ⁇ s per time slot. Any not yet occupied time slot within a frame can be used for monitoring neighbor cells.
  • Fig. 12 shows the time slots 120, numbered from zero to seven, which form a TDMA frame, whereas each TDMA frame is an element of a multiframe 122.
  • the telecommunication receiver 34 receives control messages 76.x regularly in time slot 0, whereas the telecommunication transmitter 32 transmits its bursts 72.x in an agreed time slot, here time slot 3.
  • the messages transmitted and received are spread over various frames of a multiframe. Even if it is not allowed to use a different time slot, the same time slot of another frame can be used.
  • the telecommunication standards provide timing ranges in which the mobile device 50 has to answer requests. Typically, a message will be answered as soon as possible.
  • temporal gaps can be created by transmitting a message in another frame, thus leaving a temporal gap in the current frame.
  • Characteristic 96 in Fig. 10 shows the activity of the telecommunication transmitter 32.
  • the information to be transmitted can also be transmitted in the following frame, leaving a temporal gap in the current frame.
  • a navigation chip lasts approximately 1 ms. The burst 98.2 leaves a wider temporal gap to the previous burst 98.1.
  • this method of shifting transmission to the next frame would lead to a short drop of speech. So this method is mainly used during an active data session and during signaling. Due to the shift of burst 98.2 by one frame, the navigation receiver 36 can be activated for a longer time as shown in characteristic 100, which leads to more decoded navigation chips 40 as shown in characteristic 102.
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data rates for GSM Evolution
  • Fig. 11 shows an example having a transmission characteristic 110 with two transmitting time slots and a reception characteristic 104 with four time slots.
  • temporal gaps can be created by optimizing the monitoring bursts 108.1 and 108.2 (referred to as 108.x), and by leaving transmission gaps when transmitting data.
  • the characteristic 110 shows a transmission burst 112.1, whereas in the next frame no data is transmitted so that the navigation receiver 34 can be activated in this temporal gap, as shown in characteristic 116 and the decoded navigation chips in characteristic 118.
  • the invention is not restricted to Global System for Mobile Communication (GSM) networks and the Global Positioning System (GPS).
  • GSM Global System for Mobile Communication
  • GPS Global Positioning System
  • the invention is applicable to other mobile telecommunication networks and satellite navigation systems, which cause detrimental signal interference to each other.
  • the invention can also be used in mobile telecommunication networks which are not based on Time Division Multiplex Access (TDMA).
  • TDMA Time Division Multiplex Access
  • 3G Third Generation
  • the interleaved telecommunication and location determining controller 52 can temporarily disable the telecommunication transmitter or it can operate its first baseband controller 20 in Compressed Mode, which creates temporal gaps.
  • the interleaved telecommunication and location determining controller 52 comprises a logic which analyzes the current speed and reliability of determining the location. Depending on the configured speed and reliability, the controller 52 aggregates the individual measures of the aforementioned embodiments step by step until the configured target quality is reached.
  • the described method of utilizing temporal gaps in telecommunication RF signals for an undistorted processing of navigation RF signals is implemented in the interleaved telecommunication and location determining controller 52.
  • Fig. 6 shows various alternative embodiments by dashed lines:
  • the interleaved telecommunication and location determining controller 52 may be realized as an integrated circuit 60.
  • an integrated circuit 62 combines the interleaved telecommunication and location determining controller 52 with the baseband controllers 20 and 28.
  • a single chip integrated circuit 64 contains the controllers 52, 20 and 28, and further the telecommunication RF signal processor 18 and the navigation RF signal processor 26. This single chip solution thus integrates a telecommunication section 12' and a location determining section 14', which correspond to the sections 12 and 14 of Fig. 5 , but without the antenna systems 16 and 24.
  • a direct hardware-based interface 58 between the two baseband controllers 20 and 28 is provided to exchange time critical information for enabling and disabling navigation RF signal processing.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Radio Relay Systems (AREA)
EP10159956A 2010-04-14 2010-04-14 Système et procédé de localisation et de télécommunication Active EP2378311B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT10159956T ATE549643T1 (de) 2010-04-14 2010-04-14 Verfahren und system zur ortsbestimmung und telekommunikation
EP10159956A EP2378311B1 (fr) 2010-04-14 2010-04-14 Système et procédé de localisation et de télécommunication
PCT/EP2011/055966 WO2011128422A1 (fr) 2010-04-14 2011-04-14 Télécommunications et procédé et système de détermination de localisation

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EP10159956A EP2378311B1 (fr) 2010-04-14 2010-04-14 Système et procédé de localisation et de télécommunication

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EP2378311B1 EP2378311B1 (fr) 2012-03-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111654902A (zh) * 2020-06-02 2020-09-11 Tcl通讯（宁波）有限公司 降低对移动终端gps信号干扰的方法及装置、移动终端
EP4215931A1 (fr) 2022-01-25 2023-07-26 ryd GmbH Détermination d'un emplacement de véhicule

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6529493B1 (en) * 1997-04-10 2003-03-04 Alcatel Mobile station combining telecommunications and positioning functions, and a corresponding method of receiving positioning signals by a mobile station
US20030045333A1 (en) * 2001-08-31 2003-03-06 Nec Corporation Compound information terminal, mobile communications system and control method thereof
US6831911B1 (en) * 2000-11-18 2004-12-14 Ashvattha Semiconductor Inc. System and method for receiving and processing GPS and wireless signals
US20090239548A1 (en) * 2004-11-18 2009-09-24 St-Ericsson Sa Apparatus and method for deriving position information

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6529493B1 (en) * 1997-04-10 2003-03-04 Alcatel Mobile station combining telecommunications and positioning functions, and a corresponding method of receiving positioning signals by a mobile station
US6831911B1 (en) * 2000-11-18 2004-12-14 Ashvattha Semiconductor Inc. System and method for receiving and processing GPS and wireless signals
US20030045333A1 (en) * 2001-08-31 2003-03-06 Nec Corporation Compound information terminal, mobile communications system and control method thereof
US20090239548A1 (en) * 2004-11-18 2009-09-24 St-Ericsson Sa Apparatus and method for deriving position information

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111654902A (zh) * 2020-06-02 2020-09-11 Tcl通讯（宁波）有限公司 降低对移动终端gps信号干扰的方法及装置、移动终端
CN111654902B (zh) * 2020-06-02 2024-01-19 Tcl通讯（宁波）有限公司 降低对移动终端gps信号干扰的方法及装置、移动终端
EP4215931A1 (fr) 2022-01-25 2023-07-26 ryd GmbH Détermination d'un emplacement de véhicule

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ATE549643T1 (de) 2012-03-15
EP2378311B1 (fr) 2012-03-14

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